"The ball struck her in the back of the head, at the base of her neck," said Lieutenant Trent Colledge.
The tragedy has been described as a "freak accident" especially since the golf cart was not stopped directly in front or behind Hill, but rather 45 to 90 degrees to the left.
"It's an extremely tragic accident," Colledge added.
"We are so grateful for all the love, support, and prayers made in our behalf during this difficult time," her mother Talysa said in a statement.
"We've truly felt comforted. Aria was the sassiest girl in the world. She was silly, spunky, creative, unique, and so, so full of love for everyone she came in contact with. There is a huge hole in our hearts that she has taken with her back to Heaven … Fly high my little angel."